CouchDB查看模式匹配在密钥中组合数字和Alpha

Question

迄今为止，我在couchdb中创建的所有视图都使用了数字值。向键添加字母字符时，我感到有点意外。

我的观点是返回值如预期：

[2011,12,5,14,22,"foo"] 
[2011,12,5,14,23,"foo"] 
[2011,12,5,14,42,"bar"] 
[2011,12,5,15,2,"foo"] 
[2011,12,5,15,21,"foo"] 
[2011,12,5,15,23,"foo"] 
[2011,12,5,16,2,"foo"] 
[2011,12,5,16,21,"foo"] 
[2011,12,5,16,23,"foo"] 
[2011,12,5,16,42,"bar"] 

然而，当我查询这些使用的开始键：

[2011,12,5,14,16,"foo"] 

和结束键

[2011,12,5,16,60,"foo\ufff0"] 


http://couchdb_host:5984/the_db/_design/cf/_view/errors?startkey=[2011,12,5,14,16,%22foo%22]&endkey=[2011,12,5,16,60,%22foo\ufff0%22]&group_level=6 

我在结果中不断得到“bar”的值：

{"rows":[ 
{"key":[2011,12,5,14,22,"foo"],"value":2}, 
{"key":[2011,12,5,14,23,"foo"],"value":1}, 
{"key":[2011,12,5,14,42,"bar"],"value":1}, 
{"key":[2011,12,5,15,2,"foo"],"value":1}, 
{"key":[2011,12,5,15,21,"foo"],"value":2}, 
{"key":[2011,12,5,15,23,"foo"],"value":1}, 
{"key":[2011,12,5,16,2,"foo"],"value":1}, 
{"key":[2011,12,5,16,21,"foo"],"value":2}, 
{"key":[2011,12,5,16,23,"foo"],"value":1}, 
{"key":[2011,12,5,16,42,"bar"],"value":1} 
]} 

我在哪里掉下来？我期望“bar”被忽略，任何以“foo”开头的东西都会被返回。这一切在纸上似乎都很简单！

线索？

Answer 1

CouchDB正在返回所有按键，它们对startkey和小于（或等于）endkey排序较高（或相等）。 [2011,12,5,14,42，“bar”]的排序高于[2011,12,5,14,16，“foo”]，因为42高于16，低于[2011,12,5， 16,60，“富\ ufff0”]，因为42小于60

本页面描述按键的排序方式：http://wiki.apache.org/couchdb/View_collation